﻿using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace Wechat.Util.JsonHelp
{
  public  class JsonDataTable
    {
        #region 根据Json返回DateTable,JSON数据格式如:

        /// <summary>   
        /// 根据Json返回DateTable,JSON数据格式如:   
        /// {table:[{column1:1,column2:2,column3:3},{column1:1,column2:2,column3:3}]}   
        /// </summary>   
        /// <param name="strJson">Json字符串</param>   
        /// <returns></returns>   
        public static DataTable JsonToDataTable(string strJson)
        {
            //取出表名   
            Regex rg = new Regex(@"(?<={)[^:]+(?=:\[)", RegexOptions.IgnoreCase);
            string strName = rg.Match(strJson).Value;
            DataTable tb = null;
            //去除表名   
            if (strJson.StartsWith("["))
            {
                strJson = strJson.Substring(strJson.IndexOf("[") + 1);
                strJson = strJson.Substring(0, strJson.LastIndexOf("]"));
            }

            //获取数据   
            rg = new Regex(@"(?<={)[^}]+(?=})");
            MatchCollection mc = rg.Matches(strJson);
            for (int i = 0; i < mc.Count; i++)
            {
                string strRow = mc[i].Value;
                string[] strRows = strRow.Split(',');

                //创建表   
                if (tb == null)
                {
                    tb = new DataTable();
                    tb.TableName = strName;
                    foreach (string str in strRows)
                    {
                        DataColumn dc = new DataColumn();
                        string[] strCell = str.Split(':');
                        dc.ColumnName = strCell[0].Replace("\"", "");
                        tb.Columns.Add(dc);
                    }
                    tb.AcceptChanges();
                }

                //增加内容   
                DataRow dr = tb.NewRow();
                for (int r = 0; r < strRows.Length; r++)
                {
                    dr[r] = strRows[r].Split(':')[1].Trim().Replace("，", ",").Replace("：", ":").Replace("\"", "");
                }
                tb.Rows.Add(dr);
                tb.AcceptChanges();
            }

            return tb;
        }

        #endregion
    }
}
